Improvement in plasks foe casting



G. P.. SISSON. FLASK FOR GAS/TING.

No. 69,372. Pate nted Oct. 1, 1867.

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IMPROVEMENT IN FLASKS FORv CASTING.

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TO ALL WHOM IT MAY CONCERN:

Be it known that LGEORGE I. srssox, of Florence, in Northampton, in tn e county of Hampshire, and State of Massachusetts, have invented certain new and useful improvements in Removable Flasks for Moulding; and I do hereby declare that the following is a full and exact description thereof.

My invention applies to the moulding of all that class of small castings which are usually executed by what is termed snap-moulding, and itallows the same system of moulding tobe extended to larger castings than usual. It also increases the'perfeetion and the facility of this style of moulding, which mayin general terms be described as using the flask as a'means merely of producing the mould, and not employing it as a support for the mould when the metal is poured. In snap-moulding, one ilask will serve for making as many moulds as may be required, the flask being removed after each .n'ould is perfected, and used as a means for making the next. Assnap-moulding is ordinarily conducted, a limit is soon reached in the attempt to east large work by this means, because the tenacity of the moulding-sand is not suiiicicnt to resist thepressure of any considerable mass of melted iron; and as the flasks for moulding were heretofore constructed, there was always a liability of the fastening becoming detached or loosened at too early 8. period, so as to impair-the correctness of the work.

I will proceed to describe what I consider the best means of carrying out my invention, and will afterwards designate the points'wn-ich I believe to be new therein. The accompanying drawings form-a part of this specification.

Figure Lis a. vertical sectionon the line S S in fig. 3.

Figure 2 is aside elevation I Figure 3 is a side elevation at right angles to that of fig. 2, showing the side which is on the left in fig. 2.

Figure-4 is a plan view of a portion in a position corresponding to fig. 3.

Figures 3 and 4' represent modifications of the details.

Similar letters of reference indicate corresponding parts in all the figures. Tints are employed merely to aid in distinguishing parts, and do not indicate-material. The material of the whole maybe cast iron and wood.

' A A are twopieces of pine or other suitable wood, firmly secured together at right angles. B B are similar pieces, similarly secured, and C is a broad and durable hinge, which connects them so as to form, when the opposite angle is also secured, a'holloiv rectangularframe, to serve as a flask, or, rather, as one of the complete parts, the cope or the nowel of the flask. D D and E E indicate the; corresponding parts of the other portion of the flask, and F i sthc hinge for the same. So far as yet described, my flask is similar to the ordinary snap-flasks in common use. G and II are broad bands of past iron, or other suitable rigid material, adapted to endure heat, and to afford the requisite strength. They are of less width than the corresponding portions of the flask, and are not adapted to open like the flasks, but are formed each in a single piece. They are of such size that they may be introduced easily previous to filling each part of the flask. I are slight projecting pieces let into the wood, as represented, and adapted to-form supports and guides for the bands G- and H, the latter heingnotchcd with a file or otherwise, to receive these little projections or short shelves. In filling the nowcl A A BB it is of course laid in an inverted position, so that the shelves I I lie close to the mould-board. The band G, on being dropped into position, rests also on the moulding-bpard, its notches receiving the shelves I I, as will be obvious. After ramming the moulding-sand, and completing the filling of the. w novel in the ordinary manner, it is lifted and turned over, and the moulding-board removed. The cope D DE E is now applied, and the band II dropped into position. The lower edge of this band touches and rests upon what was originally the lower edge of the previously introduced band G, and its notch also fits on the short Shelf I, in the base of the cope.- After fillingthc cope with monldinggaiid, and ramming it tightly'in the ordinary manner, the entirp cope D E F, and its contents, must be lifted to allow the removal of the pattern. This leaves the band H unsupported by the band G, on which it previously rested, and it might fall, carrying with it a portion of the moulding-sand, and destroying the mould, except for the short shelves I in the base of the cope, whieh now perform the important function of supporting the weight of the hand .I-I. After the pattern is removed, and the cope is again returned to its place on the nowel, the baud H is again supported on theband G, and the short shelves I become, as before, of no effect. It would be sufficient to employ the shortshelves I on the cope alone, but in practice I prefer to employ the same on both cope and nowel, as it frequently happens,

either through accident or design, that the flask is worked in a reversed position; that is, the part here described as the cope, becomes the nowel when reversed.- When a flask is removed by opening both the cope and the or ted elone b -the naeit o z ellliesion 0 ts tieles one to ano'th but also wreatl aided by Kimmy fethwo Thesmmllhhm'mfividth as fiaq diret to furnish a sufiicient support. wide these bands should be made for any given variety of casting-will depend on the shape and size of the erticle to be cast. I have represented a good width for ordinary practice. In moulding some articles it is not necessary to use two. It.is sufiieient to use the hand (3- alone, which, by snpportiug the moulding-send of the nowel alone, gives sufiicientstre'ngth to enable the mould to dispense with any further support. It will he ot' course understood that my flasks may be made of various other shapes than the plqin rectangular form here represented, and that the bends G end II nuty he correspondingly shaped. The edges may thus he s calloped in any irregular shape, and the entire flash" may be circular, or partially circular, triangular, or pentagoual or any other shape.

Having now fully described my ;invention, what I claim as new therein, and desire to secure by Letters Patent, is as follows i I claim the bands-G and H, or either of them, in combiuetion with a spe nflask, and arranged to operate therewith, substantially in the mnnner and for the purpose herein specified.

GEORGE P. SISSON. Witnesses:

WM. G. DnY, FRANK A. HADICKE. 

